Porsche Boxter vs Porsche Cayenne: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Porsche Boxter
83%
MOT pass rate · 30 vehicles
Porsche Cayenne
84%
MOT pass rate · 40,483 vehicles
Verdict: On MOT pass rate the Porsche Boxter (83%) and Porsche Cayenne (84%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Porsche Boxter | Porsche Cayenne |
|---|---|---|
| MOT pass rate | 83% | 84% ✓ |
| MOT failure rate | 17% | 16% ✓ |
| Faults & advisories per test | 1.4 | 1.2 ✓ |
| Dangerous-fault share | 1% ✓ | 3% |
| Average mileage | 73,638 mi | 87,610 mi |
| Sample size (vehicles) | 30 | 40,483 |
Most common faults
Porsche Boxter
- Nearside Front Tyre worn close to the legal limit (4.1.E.1)
- Offside Front Tyre worn close to the legal limit (4.1.E.1)
- Rear Brake disc worn, pitted or scored, but not seriously weakened (1.1.14 (a) (ii))
- Rear brake disc worn, pitted or scored, but not seriously weakened (3.5.1i)
- Offside Rear Brake pipe corroded, covered in grease or other material (1.1.11 (c))
- Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
Porsche Cayenne
- Front Brake pad(s) wearing thin (1.1.13 (a) (ii))
- Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Rear Brake pad(s) wearing thin (1.1.13 (a) (ii))
- Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
Reliability FAQ
On MOT pass rate the Porsche Boxter (83%) and Porsche Cayenne (84%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Porsche Boxter report Full Porsche Cayenne report Most reliable cars
Pass rates are computed over completed (pass/fail) MOT tests. Reliability also depends on age, mileage and upkeep — see each model's page for the full picture.